How to find the 2 closest concave points of the 
concave polygon?
pointsArr = np.array([[ 1.9271976e+00, 5.5460022e+01, -1.0658541e+03],
[ 1.7924013e+00, 5.5538818e+01, -1.0669388e+03],
[ 2.1858673e+00, 5.5213562e+01, -1.0623199e+03],
[ 1.4601125e+00, 5.5707939e+01, -1.0692297e+03],
[ 2.0059831e+00, 5.4997200e+01, -1.0588644e+03],
[ 8.9513421e-01, 5.5883709e+01, -1.0714202e+03],
[ 9.8966092e-01, 5.4901222e+01, -1.0565194e+03],
[ 4.8500625e-03, 5.6014091e+01, -1.0726365e+03],
[-3.2594287e-01, 5.4927223e+01, -1.0557750e+03],
[-1.1316023e+00, 5.6141266e+01, -1.0735903e+03],
[-1.6570321e+00, 5.4980713e+01, -1.0554364e+03],
[-2.4740057e+00, 5.6261200e+01, -1.0742552e+03],
[-2.8677700e+00, 5.5085464e+01, -1.0559839e+03],
[-3.6821196e+00, 5.6365063e+01, -1.0747915e+03],
[-3.8956981e+00, 5.5270367e+01, -1.0579122e+03],
[-4.9294081e+00, 5.6470322e+01, -1.0753149e+03],
[-4.7510505e+00, 5.5439716e+01, -1.0597529e+03],
[-6.1751361e+00, 5.6548107e+01, -1.0754209e+03],
[-5.7690206e+00, 5.5625332e+01, -1.0617009e+03],
[-7.4167490e+00, 5.6561523e+01, -1.0745487e+03],
[-6.6816468e+00, 5.5787350e+01, -1.0633801e+03],
[-8.2456007e+00, 5.6491898e+01, -1.0727682e+03],
[-7.4555492e+00, 5.5900158e+01, -1.0644293e+03],
[-9.5117025e+00, 5.6533108e+01, -1.0722987e+03],
[-8.6950483e+00, 5.5933098e+01, -1.0638568e+03],
[-1.0713805e+01, 5.6584663e+01, -1.0720425e+03],
[-9.3179131e+00, 5.5849777e+01, -1.0620460e+03],
[-1.1779905e+01, 5.6563503e+01, -1.0707952e+03],
[-1.0199975e+01, 5.5745140e+01, -1.0596853e+03],
[-1.2771358e+01, 5.6533848e+01, -1.0694832e+03],
[-1.1118530e+01, 5.5704197e+01, -1.0582644e+03],
[-1.3500714e+01, 5.6501316e+01, -1.0683545e+03],
[-1.2302798e+01, 5.5677280e+01, -1.0568269e+03],
[-1.4472707e+01, 5.6398602e+01, -1.0659452e+03],
[-1.3486665e+01, 5.5708134e+01, -1.0562708e+03],
[-1.5076267e+01, 5.6297958e+01, -1.0638871e+03],
[-1.4672162e+01, 5.5814697e+01, -1.0568678e+03],
[-1.5546223e+01, 5.6144699e+01, -1.0611423e+03],
[-1.5542609e+01, 5.6051472e+01, -1.0597238e+03]], )
